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Pure Ruby library for generating charts in SVG format

SVG::Graph allows one to generate charts, that is, graphs where the values of
one axis are not scalar. It has a very similar API to the Perl library
SVG::TT::Graph, and the resulting charts also look the same. This isn't
surprising, because SVG::Graph started as a loose port of SVG::TT::Graph,
although the internal code no longer resembles the Perl original at all.